The average utilization percent of nitrogen, phosphate and potassium fertilizer of spring maize covered with film on dry land is 38.1, 21.2, 40.3 percent and it is increased by 12.5, 8.3, 5.5 percent, respectively than film -uncovered.

• 覆膜旱地春玉米氮肥利用率平均38.；1%25；比露地提高12